Vox:

There are huge benefits to salting the roads. One 1992 study found that spreading salt can reduce accidents by 87 percent during and after a snowstorm.But road salt also comes with major downsides: Salt is corrosive, chewing through cars, trucks, concrete, and steel bridges. Worse still, when all that salt dissolves and washes away, it steadily accumulates in rivers and streams. Other times, moose and elk get attracted to the salt and wander onto roads, raising the risk of crashes.

We have similar issues here in Canada with road salt and its affect on cars and the environment. That last sentence came to light for me while riding my motorcycle in the Banff National Park. I came around a corner and there was a herd of massive elk in the middle of the road, licking the salt off the pavement. It created a very high Pucker Factor, to say the least.